- server.py: Increase ping_timeout 10->60, ping_interval 5->25 to prevent
frequent socket disconnects during audio streaming
- server.py: Guard dj_start() against reconnect loops - only clear pre-roll
and emit broadcast_started on a fresh broadcast, not on DJ reconnects
- listener.js: Add polling fallback to transports (websocket-only caused
silent failure on upgrade error), set reconnectionAttempts to Infinity
- script.js: Same transport fallback fix for DJ panel socket
- techdj_qt.py: Add _broadcast_started flag to StreamingWorker.on_connect
so streaming_started signal only fires once; reconnects resume silently.
Reset flag in stop_streaming() for clean next session.
- Created standalone listener.html, listener.js, listener.css
- Listener server now serves listener.html instead of index.html
- Eliminates flash of DJ panel when loading listener page
- setup_shared_routes() accepts index_file parameter
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